Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden:
The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-...
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| Format: | Abschlussarbeit Elektronisch E-Book |
| Sprache: | English |
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Luleå tekniska universitet, Geovetenskap och miljöteknik
2022
Luleå 2022 |
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| Zusammenfassung: | The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-Zn) (Viscaria, Eastern Pahtohavare), epigenetic stratabound Cu ± Au (Pahtohavare), and iron oxide-copper-gold (IOCG, Rakkurijärvi) deposits. However, the timing of IOA versus IOCG within the tectonic evolution is in question based on structural investigations showing Cu- and Fe-sulfides occur in late-orogenic structures. Here we use an established tectonic framework to constrain mineral systems (tectonic/thermal drives, metal and ligand sources, fluid pathways, traps, remobilization mechanisms) related to the early and late phases of the Svecokarelian orogeny in the Kiruna mining district. U-Pb zircon geochronology of intrusions in the district indicates a thermal drive was present during the early phase of the Svecokarelian orogeny from ca. 1920-1865 Ma, however remains enigmatic for the late Svecokarelian orogeny. Zircon grains from a magnetite-ilmenite gabbro yielded an age of 1881 ± 8 Ma, coeval with the Kiirunavaara IOA deposit and suggested to represent an important generation of mafic magmatism related to the ore. Lithogeochemistry of early bimodal Svecokarelian intrusions in the district indicates a within-plate to active continental margin environment with a volcanic arc affinity, pointing to a back arc environment. Epsilon Ndi and 87Sr/86Sri values calculated from the U-Pb ages for the igneous intrusions were compared to samples of ore-related alteration from epigenetic Pahtohavare and Rakkurijärvi deposits, district greenstone, and Archean samples. Results show that each deposit sourced Sr and Nd from a variety of rocks suggesting broad fluid transport. Each deposit has a distinct Sr mixing trend suggesting they formed from different ore-forming fluids and path |
| Beschreibung: | 1 Online-Ressource |
| ISBN: | 9789177909965 |
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| 520 | 3 | |a The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-Zn) (Viscaria, Eastern Pahtohavare), epigenetic stratabound Cu ± Au (Pahtohavare), and iron oxide-copper-gold (IOCG, Rakkurijärvi) deposits. However, the timing of IOA versus IOCG within the tectonic evolution is in question based on structural investigations showing Cu- and Fe-sulfides occur in late-orogenic structures. Here we use an established tectonic framework to constrain mineral systems (tectonic/thermal drives, metal and ligand sources, fluid pathways, traps, remobilization mechanisms) related to the early and late phases of the Svecokarelian orogeny in the Kiruna mining district. | |
| 520 | 3 | |a U-Pb zircon geochronology of intrusions in the district indicates a thermal drive was present during the early phase of the Svecokarelian orogeny from ca. 1920-1865 Ma, however remains enigmatic for the late Svecokarelian orogeny. Zircon grains from a magnetite-ilmenite gabbro yielded an age of 1881 ± 8 Ma, coeval with the Kiirunavaara IOA deposit and suggested to represent an important generation of mafic magmatism related to the ore. Lithogeochemistry of early bimodal Svecokarelian intrusions in the district indicates a within-plate to active continental margin environment with a volcanic arc affinity, pointing to a back arc environment. Epsilon Ndi and 87Sr/86Sri values calculated from the U-Pb ages for the igneous intrusions were compared to samples of ore-related alteration from epigenetic Pahtohavare and Rakkurijärvi deposits, district greenstone, and Archean samples. Results show that each deposit sourced Sr and Nd from a variety of rocks suggesting broad fluid transport. | |
| 520 | 3 | |a Each deposit has a distinct Sr mixing trend suggesting they formed from different ore-forming fluids and path | |
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| spelling | Logan, Leslie Verfasser aut Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Leslie Logan Luleå tekniska universitet, Geovetenskap och miljöteknik 2022 Luleå 2022 1 Online-Ressource txt rdacontent c rdamedia cr rdacarrier Dissertation Luleå tekniska universitet 2022 The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-Zn) (Viscaria, Eastern Pahtohavare), epigenetic stratabound Cu ± Au (Pahtohavare), and iron oxide-copper-gold (IOCG, Rakkurijärvi) deposits. However, the timing of IOA versus IOCG within the tectonic evolution is in question based on structural investigations showing Cu- and Fe-sulfides occur in late-orogenic structures. Here we use an established tectonic framework to constrain mineral systems (tectonic/thermal drives, metal and ligand sources, fluid pathways, traps, remobilization mechanisms) related to the early and late phases of the Svecokarelian orogeny in the Kiruna mining district. U-Pb zircon geochronology of intrusions in the district indicates a thermal drive was present during the early phase of the Svecokarelian orogeny from ca. 1920-1865 Ma, however remains enigmatic for the late Svecokarelian orogeny. Zircon grains from a magnetite-ilmenite gabbro yielded an age of 1881 ± 8 Ma, coeval with the Kiirunavaara IOA deposit and suggested to represent an important generation of mafic magmatism related to the ore. Lithogeochemistry of early bimodal Svecokarelian intrusions in the district indicates a within-plate to active continental margin environment with a volcanic arc affinity, pointing to a back arc environment. Epsilon Ndi and 87Sr/86Sri values calculated from the U-Pb ages for the igneous intrusions were compared to samples of ore-related alteration from epigenetic Pahtohavare and Rakkurijärvi deposits, district greenstone, and Archean samples. Results show that each deposit sourced Sr and Nd from a variety of rocks suggesting broad fluid transport. Each deposit has a distinct Sr mixing trend suggesting they formed from different ore-forming fluids and path Erz (DE-588)4152966-2 gnd rswk-swf Kiruna (DE-588)4098455-2 gnd rswk-swf Schweden (DE-588)4077258-5 gnd rswk-swf tectonic framework mineral system IOCG IOA remobilization sulfur isotopes trace elements geochronology Pahtohavare Viscaria Rakkurijärvi (DE-588)4113937-9 Hochschulschrift gnd-content Erz (DE-588)4152966-2 s Schweden (DE-588)4077258-5 g Kiruna (DE-588)4098455-2 g DE-604 https://www.diva-portal.org/smash/record.jsf?pid=diva2%3A1619752&dswid=-6385 Archivierung kostenfrei Volltext |
| spellingShingle | Logan, Leslie Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Erz (DE-588)4152966-2 gnd |
| subject_GND | (DE-588)4152966-2 (DE-588)4098455-2 (DE-588)4077258-5 (DE-588)4113937-9 |
| title | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
| title_auth | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
| title_exact_search | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
| title_exact_search_txtP | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
| title_full | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Leslie Logan |
| title_fullStr | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Leslie Logan |
| title_full_unstemmed | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Leslie Logan |
| title_short | Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
| title_sort | utilizing a tectonic framework to constrain the mineral system and remobilization in the kiruna mining district sweden |
| topic | Erz (DE-588)4152966-2 gnd |
| topic_facet | Erz Kiruna Schweden Hochschulschrift |
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